2. 外语
  3. If nothing is done to protect the environment, millions of species that are alive today will have become______.

If nothing is done to protect the environment, millions of species that are alive today will have become______.

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问题 If nothing is done to protect the environment, millions of species that are alive today will have become______.
选项 A、deteriorated
B、degenerated
C、suppressed
D、extinct
答案D
解析 题意是：如果不采取任何措施来保护环境，数百万种今天尚存的物种将会______。[D] extinct“灭种的”，符合题意。  [A] deteriorated“恶化，降低”， [B] degenerated“堕落，退步”，[C] suppressed“镇压”都与题意不符。
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大学英语六级

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